Cannabis is a plant that has been used for medicinal and recreational purposes for centuries. The term cannabis can refer to the plant itself, its products, or its active ingredients. In crossword puzzles, the term 'POT' is often used to refer to cannabis, as it is a three-letter word. The term 'sess' is also used to refer to cannabis, as it is a four-letter word. Both terms are used to refer to cannabis in crossword puzzles.